You find your license code in an email with the subject “Your Letter Opener for macOS Mail License” from the sender email@example.com.
Enter your license code
- In Mail go to Mail > Letter Opener for macOS Mail > Registration …
- In the following window enter the license code you got via Mail after purchasing Letter Opener for macOS Mail and click OK.
Can I use Letter Opener on multiple machines?
You can install it free of charge on every Mac you own with one license key.
If more than one person will use Letter Opener, then multiple licenses must be purchased.